[ci skip] Merge ActiveModel::SecurePassword guide from @aditya-kapoor
[ci skip] Merge ActiveModel::SecurePassword guide from @aditya-kapoor

Merge branch 'active-model-secure-password-guide' of https://github.com/aditya-kapoor/rails into aditya-kapoor-active-model-secure-password-guide

Conflicts:
	guides/source/active_model_basics.md

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